Kohler COMMAND CH18-745 User Manual download pdf (Page 125)

8.8

Section 8

Electrical System and Components

c. If neither side is firing, recheck position of

ignition switch and check for shorted kill lead.

Test Procedure for SMART-SPARK

Ignition

Systems

The following procedures are provided for

troubleshooting ignition problems on SMART-SPARK

™

equipped engines. They will allow you to isolate and

pinpoint the failed component(s).

Special Tools Required:

• Hand Tachometer

• Tester* (SPX Part No. KO1046 formerly Kohler

Part No. 24 455 02-S)

• Automotive timing light

• Multi-meter (digital)

Specifications Required:

• Spark plug gap 0.76 mm (0.030 in.)

• Ignition module air gap 0.28/0.33 mm

(0.011-0.013 in.), 0.30 mm (0.012 in.) nominal

*NOTE: Ignition tester (SPX Part No. KO1046 formerly

Kohler Part No. 24 455 02-S) must be used

to test ignition on these engines. Use of any

other tester can result in inaccurate findings.

Battery on unit must be fully charged and

properly connected before making any of

these tests (a battery that is hooked up or

charged backward will crank the engine, but it

won’t have spark). Be sure drive is in neutral

and all external loads are disconnected.

Test 1 – Isolate and verify the trouble is within the

engine ignition system

1. Locate the plug connectors where the wiring

harnesses from the engine and equipment are

joined. Separate the connectors and remove the

white “kill” lead from the engine connector. Rejoin

the connectors and position or insulate the kill

lead terminal so it cannot touch ground. Try to

start** the engine to verify whether the reported

problem is still present.

a. If the problem is gone, the electrical system on

the unit is suspect. Check the key switch,

wires, connections, safety interlocks, etc.

b. If the problem persists the condition is

associated with the ignition or electrical

system of the engine. Leave the kill lead

isolated until all testing is completed.

**NOTE: If the engine starts or runs during any of the

testing, you may need to ground the kill lead

to shut it down. Because you have

interrupted the kill circuit, it may not stop

using the switch.

Test 2 – Test for spark

1. With the engine stopped, disconnect one spark

plug lead. Connect the spark plug lead to post

terminal of spark tester SPX Part No. KO1046

(formerly Kohler Part No. 24 455 02-S), and

attach tester clip to a good engine ground.

NOTE: If two testers are available, testing can be

performed simultaneously for both cylinders.

However, if only one tester is available, two

individual tests must be performed. The side

not being tested must have the spark plug

lead connected or grounded. Do not crank

the engine or perform tests with one spark

plug lead disconnected and not grounded or

permanent system damage may occur.

2. Crank the engine over, establishing a minimum of

550-600 RPM, and observe tester(s) for spark.

3. On a twin cylinder engine, repeat the spark test

on the opposite cylinder if cylinders are being

tested individually.

a. If both cylinders have good spark, but the

engine runs poorly, install new spark plugs

gapped at 0.76 mm (0.030 in.), and retest

engine performance. If problem persists, go

to Test 3.

b. If one cylinder had good spark, but the

other cylinder had no spark or intermittent

spark, go to Test 3.

c. If there was no spark or intermittent spark

on both cylinders, go to Test 4.

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Kohler COMMAND CH18-745 User Manual Page 125

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